mbed library sources
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targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/sleep.c
- Committer:
- mbed_official
- Date:
- 2015-05-22
- Revision:
- 548:1abac31e188e
- Parent:
- 526:7c4bdfe6a168
File content as of revision 548:1abac31e188e:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "device.h" #if DEVICE_SLEEP #include "sleep_api.h" #include "sleepmodes.h" #include "cmsis.h" #include "em_emu.h" #include "em_int.h" uint32_t sleep_block_counter[NUM_SLEEP_MODES] = {0}; /** * Sleep mode. * Enter Energy Mode 1, which turns off the clock to the CPU. * * In EM1, the CPU is sleeping and the power consumption is only 50 μA/MHz. * All peripherals, including DMA, PRS and memory system, are still available. */ void sleep(void) { if (sleep_block_counter[0] > 0) { // Blocked everything below EM0, so just return return; } else if (sleep_block_counter[1] > 0) { // Blocked everything below EM1, enter EM1 EMU_EnterEM1(); } else if (sleep_block_counter[2] > 0) { // Blocked everything below EM2, enter EM2 EMU_EnterEM2(true); } else if (sleep_block_counter[3] > 0) { // Blocked everything below EM3, enter EM3 EMU_EnterEM3(true); } return; } /** * Deep Sleep mode. * Enter Energy Mode 2, turning off all high-frequency clocks. * * In EM2 the high frequency oscillator is turned off, but with the 32.768 kHz * oscillator running, selected low energy peripherals (LCD, RTC, LETIMER, * PCNT, LEUART, I2C, LESENSE, OPAMP, USB, WDOG and ACMP) are still * available. This gives a high degree of autonomous operation with a current * consumption as low as 1.1 μA with RTC enabled. Power-on Reset, Brown-out * Detection and full RAM and CPU retention is also included. */ void deepsleep(void) { EMU_EnterEM2(true); } /** Block the microcontroller from sleeping below a certain mode * * This will block sleep() from entering an energy mode below the one given. * -- To be called by peripheral HAL's -- * * After the peripheral is finished with the operation, it should call unblock with the same state * */ void blockSleepMode(sleepstate_enum minimumMode) { INT_Disable(); sleep_block_counter[minimumMode]++; INT_Enable(); } /** Unblock the microcontroller from sleeping below a certain mode * * This will unblock sleep() from entering an energy mode below the one given. * -- To be called by peripheral HAL's -- * * This should be called after all transactions on a peripheral are done. */ void unblockSleepMode(sleepstate_enum minimumMode) { INT_Disable(); if(sleep_block_counter[minimumMode] > 0) { sleep_block_counter[minimumMode]--; } INT_Enable(); } #endif